Variable Type Flex Brake System Speed-Adaptive Control

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Solution Overview

Problem

Existing brake systems using electric boosters uniformly control braking hydraulic pressure without considering initial braking speed, leading to inconsistent braking sensations across different speed sections.

Innovation Solution

A variable type flex brake system that allows drivers to select braking maps based on initial braking speed, adjusting braking pressure slopes for low-speed, medium-speed, and high-speed sections, and automatically adjusts these slopes in response to changing driving conditions through a passive or active flex brake mode.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If uniform braking pressure control is used without considering initial braking speed, then the brake system structure is simple and control is easy, but the braking sense becomes inconsistent across different speed sections

Engineering Contradiction:

Improvebraking control simplicityVSAvoidbraking sense consistency across speed sections

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by making the braking pressure control adaptive rather than static. The control unit dynamically adjusts braking pressure based on real-time detection of initial braking speed, selecting different control strategies for low-speed, medium-speed, and high-speed sections. This dynamic adaptation resolves the contradiction by maintaining simple overall structure while achieving speed-specific braking optimization.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the control parameter from uniform braking pressure to speed-dependent braking pressure. By detecting initial braking speed and adjusting pressure control parameters accordingly, the system achieves consistent braking sense across different speed sections while maintaining relatively simple control logic through predefined speed thresholds and corresponding control strategies.

Inventive Principle:

Principle #35Parameter changes

2Speed

If braking pressure is rapidly increased for high speed sections, then responsiveness is improved, but braking comfort deteriorates in low speed sections

Engineering Contradiction:

Improvebraking responsivenessVSAvoidbraking comfort

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by implementing different braking pressure control characteristics for different speed sections. Low-speed sections receive gentle, gradual pressure increase for comfort, while high-speed sections receive rapid pressure increase for responsiveness. This localized optimization resolves the contradiction by tailoring pressure control to specific operating conditions rather than using a uniform approach.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the braking speed range into distinct sections (low-speed, medium-speed, high-speed) with different control strategies. This segmentation allows the system to optimize braking characteristics for each speed range independently, achieving both comfort in low-speed sections and responsiveness in high-speed sections without compromise.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If multiple braking maps are provided for different speed sections, then braking sense consistency is improved, but device complexity increases

Engineering Contradiction:

Improvebraking map selection capabilityVSAvoidcontrol unit complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies universality by designing a single control unit that performs multiple functions: detecting initial braking speed, determining the appropriate speed section, selecting the corresponding braking map, and controlling braking pressure. This multi-functional approach provides comprehensive braking optimization across all speed sections while avoiding the need for separate control systems for each speed range.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent applies preliminary action by pre-defining multiple braking maps corresponding to different speed sections before actual braking occurs. The control unit stores these braking maps in advance and simply selects the appropriate one based on detected initial braking speed, rather than calculating optimal braking parameters in real-time. This preliminary preparation reduces computational complexity during actual braking operation.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11414061B2Variable type flex brake system

Publication Date: 2022.08.16 HYUNDAI MOTOR CO LTD

AI summary

A variable type flex brake system includes: a driving control unit that receives interior or exterior information of a vehicle, provides an autonomous driving control mode or a normal driving control mode, calculates a required braking force in the autonomous driving and normal driving control modes, and generates a braking force signal corresponding to the required braking force; a first selection unit selecting a braking slope corresponding to a speed belonging to any one of low-speed, medium-speed, and high-speed sections to generate a first braking map; a second selection unit selecting a braking slope corresponding to a speed belonging to remaining speed sections that are not selected in the first selection unit, to generate a second braking map; and a braking control unit generating a braking-hydraulic-pressure signal based on the first or second braking map in response to the required braking force signal.